تقرير
Universality and unconventional enhancement of flux-flow resistivity in Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$
| العنوان: | Universality and unconventional enhancement of flux-flow resistivity in Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ |
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| المؤلفون: | Huang, Xinyi, Haney, D. J., Singh, Y. P., Hu, T., Xiao, H., Wen, Hai-Hu, Dzero, M., Almasan, Carmen. C. |
| المصدر: | Phys. Rev. B 95, 184513 (2017) |
| سنة النشر: | 2016 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons |
| الوصف: | Measurements of the current-voltage characteristics were performed on Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ single crystals with doping level $0.044 \leq x \leq 0.1$. An unconventional increase in the flux-flow resistivity $\rho_{\rm ff}$ with decreasing magnetic field was observed across this doping range. Such an abnormal field dependence of flux-flow resistivity is in contrast with the linear field dependence of $\rho_{\rm ff}$ in conventional type-II superconductors, but is similar to the behavior recently observed in the heavy-fermion superconductor CeCoIn$_5$. A significantly enhanced $\rho_{\rm ff}$ was found for the x=0.06 single crystals, implying a strong single-particle energy dissipation around the vortex cores. At different temperatures and fields and for a given doping concentration, the normalized $\rho_{\rm ff}$ scales with normalized field and temperature. The doping level dependence of these parameters strongly suggests that the abnormal upturn flux-flow resisitivity is likely related to the enhancement of spin fluctuations around the vortex cores of the optimally doped samples. Comment: 9 pages, 7 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.95.184513 |
| URL الوصول: | http://arxiv.org/abs/1612.01961 |
| رقم الأكسشن: | edsarx.1612.01961 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.95.184513 |
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